Masking and triggered unmasking of targeting ligands on nanocarriers to improve drug delivery to brain tumors.

Journal Article (Journal Article)

Long-circulating nanocarriers have been extensively studied to deliver chemotherapeutics; however, the inclusion of targeting agents compromises circulation times thereby offsetting the benefits of active targeting. Here, we formulated cysteine-cleavable phospholipid-polyethylene glycol (PEG) to 'mask' nanocarrier bound targeting ligands from RES clearance and prolong circulation times of liposomes to allow passive targeting to tumors. This detachable polymer coating can be removed after nanocarrier extravasation to tumor is achieved to expose targeting ligands and promote active targeting to tumor cells. In vivo studies on folate receptor-targeted liposomes demonstrated our ability to prolong circulation in the bloodstream using this system thereby verifying the 'masking' capacity of cleavable phospholipid-PEG(5000). Controlled modulation of uptake and cytotoxicity of targeted nanocarriers using cleavable phospholipid-PEG was demonstrated through in vitro studies. Finally, studies analyzing uptake by tumor cells in vivo confirmed enhanced intracellular delivery when tumor-inoculated animals received targeted liposomes containing cleavable phospholipid-PEG(5000) followed by a cysteine infusion to expose folate after liposomes had extravasated to tumor. These results indicate that cleavable phospholipid-PEG can be used in nanocarrier formulations for controlled exposure of targeting ligands to ensure that circulation times remain uncompromised by the inclusion of targeting agents while enabling active targeting to tumors after removal of the polymer coating.

Full Text

Duke Authors

Cited Authors

  • McNeeley, KM; Karathanasis, E; Annapragada, AV; Bellamkonda, RV

Published Date

  • August 2009

Published In

Volume / Issue

  • 30 / 23-24

Start / End Page

  • 3986 - 3995

PubMed ID

  • 19427688

Electronic International Standard Serial Number (EISSN)

  • 1878-5905

International Standard Serial Number (ISSN)

  • 0142-9612

Digital Object Identifier (DOI)

  • 10.1016/j.biomaterials.2009.04.012


  • eng